lec13 (1)

# lec13 (1) - 1 Chapter 20*RIGHT HAND RULES 2 Chapter...

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Unformatted text preview: 10/4/11 1 Chapter 20 *RIGHT HAND RULES 10/4/11 2 Chapter 20 *RIGHT HAND RULES 10/4/11 2 Chapter 20 *RIGHT HAND RULES 10/4/11 3 Chapter 20 *RIGHT HAND RULES L L 3 L 3. is taken in the direction of I. L wire with a current in a Feld: B 10/4/11 4 Chapter 20 *RIGHT HAND RULES Right-hand rule number 4 * Direction of B : Use the right hand rule. Curl fingers in direction of current flow in loop and thumb points in the direction of B. 10/4/11 5 RL Circuits Initially, an inductor acts to oppose changes in current through it. A long time later, it acts like an ordinary connecting wire. 10/4/11 6 RL Circuits ( ε on) I = ε R 1 − e − Rt / L ( ) = ε R 1 − e − t / τ RL ( ) V L = ε e − Rt / L = ε e − t / τ RL Current Max = ε / R 63% Max at t = L / R Voltage on L Max = ε / R 37% Max at t = L / R 10/4/11 7 RL Circuits R I ε a b L I • Why does τ RL increase for larger L? • Why does τ RL decrease for larger R? L opposes change in current & slows down the rate of change Large R decreases final current “easier charge up goal” Large R dissipates energy quicker, speeds up “discharge of inductor” (speeds up current loss) 10/4/11 8 Sources...
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## This note was uploaded on 12/04/2011 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue.

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lec13 (1) - 1 Chapter 20*RIGHT HAND RULES 2 Chapter...

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